Buggy code:
ankiDB . getDatabase ( ) . endTransaction ( ) ; if ( deck != null ) { deck . closeDeck ( ) ; } result = SyncClient . fullSyncFromServer ( password , username , syncName , deckPath ) ; if ( ( result . containsKey ( "code" ) ) && ( result . get ( "code" ) . equals ( "200" ) ) ) { syncChangelog . put ( "message" , res . getString ( sync_log_downloading_message ) ) ; } deck = Deck . openDeck ( deckPath ) ; AnkiDroidApp . setDeck ( deck ) ; } publishProgress ( syncName , res . getString ( sync_complete_message ) ) ; if ( ( ! ( result . containsKey ( "code" ) ) ) || ( ! ( result . get ( "code" ) . equals ( "200" ) ) ) ) { if ( result . containsKey ( "message" ) ) { syncChangelog . put ( "message" , String . format ( res . getString ( sync_log_error_specific ) , result . get ( "code" ) , result . get ( "message" ) ) ) ; } else { syncChangelog . put ( "message" , res . getString ( sync_log_error_message ) ) ; } } } else { Log . i ( TAG , "DECK<seq2seq4repair_space>DOES<seq2seq4repair_space>NOT<seq2seq4repair_space>NEED<seq2seq4repair_space>FULL<seq2seq4repair_space>SYNC" ) ; publishProgress ( syncName , res . getString ( sync_determining_differences_message ) ) ; JSONObject payload = client . genPayload ( sums ) ; int factsAddedOnLocal = payload . getJSONArray ( "added-cards" ) . length ( ) ; if ( factsAddedOnLocal > 0 ) { syncChangelog . put ( "message" , res . getQuantityString ( sync_log_facts_to_server_message , factsAddedOnLocal , factsAddedOnLocal ) ) ; } publishProgress ( syncName , res . getString ( sync_transferring_payload_message ) ) ; JSONObject payloadReply = client . getServer ( ) . applyPayload ( payload ) ; if ( payloadReply == null ) { data . success = false ; syncChangelog . put ( "message" , res . getString ( sync_log_error_message ) ) ; data . result = syncChangelog ; ankiDB . getDatabase ( ) . endTransaction ( ) ; return data ; } int factsAddedOnServer = payloadReply . getJSONArray ( "added-cards" ) . length ( ) ; if ( ( factsAddedOnLocal == 0 ) && ( factsAddedOnServer == 0 ) ) { syncChangelog . put ( "message" , res . getString ( sync_log_zero_facts ) ) ; } else if ( factsAddedOnServer > 0 ) { syncChangelog . put ( "message" , res . getQuantityString ( sync_log_facts_from_server_message , factsAddedOnServer , factsAddedOnServer ) ) ; } publishProgress ( syncName , res . getString ( sync_applying_reply_message ) ) ; client . applyPayloadReply ( payloadReply ) ; deck . initDeckvarsCache ( ) ; Reviewer . setupMedia ( deck ) ; SharedPreferences preferences = PrefSettings . getSharedPrefs ( Connection . sContext ) ; if ( preferences . getBoolean ( "syncFetchMedia" , true ) ) { doInBackgroundDownloadMissingMedia ( new Connection . Payload ( new Object [ ] { deck } ) ) ; } if ( ! ( client . getServer ( ) . finish ( ) ) ) { data . success = false ; syncChangelog . put ( "message" , res . getString ( sync_log_finish_error ) ) ; data . result = syncChangelog ; ankiDB . getDatabase ( ) . endTransaction ( ) ; return data ; } deck . reset ( ) ; deck . setLastLoaded ( deck . getModified ( ) ) ; deck . commitToDB ( ) ; Log . i ( TAG , String . format ( ENGLISH_LOCALE , "Modified:<seq2seq4repair_space>%f,<seq2seq4repair_space>LastSync:<seq2seq4repair_space>%f,<seq2seq4repair_space>LastLoaded:<seq2seq4repair_space>%f" , deck . getModified ( ) , deck . getLastSync ( ) , deck . getLastLoaded ( ) ) ) ; ankiDB . getDatabase ( ) . setTransactionSuccessful ( ) ; publishProgress ( syncName , res . getString ( sync_complete_message ) ) ; } } else { Log . i ( TAG , "NO<seq2seq4repair_space>CHANGES." ) ; publishProgress ( syncName , res . getString ( sync_no_changes_message ) ) ; syncChangelog . put ( "message" , res . getString ( sync_log_no_changes_message ) ) ; } } finally { <START_BUG> if ( ( ( ankiDB . getDatabase ( ) ) != null ) && ( ankiDB . getDatabase ( ) . inTransaction ( ) ) ) { <END_BUG> ankiDB . getDatabase ( ) . endTransaction ( ) ; } } } catch ( OutOfMemoryError e ) { Log . e ( TAG , ( "doInBackgroundSyncDeck<seq2seq4repair_space>-<seq2seq4repair_space>JSONException:<seq2seq4repair_space>" + ( e . getMessage ( ) ) ) ) ; Log . e ( TAG , Log . getStackTraceString ( e ) ) ; syncChangelog . put ( "message" , res . getString ( sync_log_error_message ) ) ; data . success = false ; } catch ( JSONException e ) { Log . e ( TAG , ( "doInBackgroundSyncDeck<seq2seq4repair_space>-<seq2seq4repair_space>JSONException:<seq2seq4repair_space>" + ( e . getMessage ( ) ) ) ) ; Log . e ( TAG , Log . getStackTraceString ( e ) ) ; syncChangelog . put ( "message" , res . getString ( sync_log_error_message ) ) ; data . success = false ; data . exception = e ; } catch ( SQLException e ) { AnkiDroidApp . saveExceptionReportFile ( e , "doInBackgroundSyncDeck" ) ; Log . w ( TAG , ( ( ( "doInBackgroundSyncDeck<seq2seq4repair_space>-<seq2seq4repair_space>Error<seq2seq4repair_space>on<seq2seq4repair_space>" + deckPath ) + ":<seq2seq4repair_space>" ) + e ) ) ; Log . e ( TAG , Log . getStackTraceString ( e ) ) ; data . returnType = AnkiDroidProxy . DB_ERROR ; syncChangelog . put ( "message" , res . getString ( sync_log_db_error ) ) ; data . success = false ; data . exception = e ; } data . result = syncChangelog ; return data ; } private Connection . Payload doInBackgroundSyncDeckFromPayload ( Connection . Payload data ) { } private Connection . Payload doInBackgroundSendFeedback ( Connection . Payload data ) { } private Connection . Payload doInBackgroundDownloadMissingMedia ( Connection . Payload data ) { } public static boolean isOnline ( ) { } public static void setContext ( Context applicationContext ) { }

Fix:
if ( ( ( ( ankiDB . getDatabase ( ) ) != null ) && ( ankiDB . getDatabase ( ) . isOpen ( ) ) ) && ( ankiDB . getDatabase ( ) . inTransaction ( ) ) ) {